论文部分内容阅读
浙江沿海和上海地区的一些高层建筑基础设计时。往往遇到柱或剪力墙底轴力的取值问题,特别是在风荷载较大而地震设防烈度相对不大的情况下,如何合理取值,更是基础设计关键所在。 《建筑地基基础设计规范(GBJ 7-89)》规定,基础设计时上部荷载按基本组合确定;《建筑结构荷载规范(GBJ-87)》和《钢筋混凝土高层结构设计与施工规程(JGJ 3-91)》给出了荷载效应组合设计值的确定以及各荷载的各项系数。在上述规定下,一般常用计算程序TAT和TBSA给出的底层柱、墙底最大组合内力工况有15项之多,稍不注意,往往将轴力最大组合项用作基础设计值,而柱底(墙底)的最大轴力在上述地区的基本计算条件下,往往是由垂直荷载和风载的组合而成的。下面从两个工程实例,就此进行分析和探讨。
Zhejiang coastal and Shanghai some high-rise building foundation design. Often encountered the value of column or shear wall axial force value, especially in the wind load is larger and the seismic fortification intensity is relatively small case, how to reasonable value is the key to the basic design. The basic design code for building foundations (GBJ 7-89) stipulates that the upper loads in the basic design shall be determined according to the basic combination; the code for construction load (GBJ-87) and the code for design and construction of reinforced concrete high-rise structures (JGJ 3- 91) "gives the determination of the design value of the load effect combination and the coefficients of each load. Under the above provisions, the commonly used calculation procedures TAT and TBSA given the bottom column, wall maximum combined internal force conditions as many as 15, with little attention, the axial force is often the largest combination of items used as the basic design value, and column The maximum axial force at the bottom (wall bottom) is often a combination of vertical and wind loads under the basic calculation conditions in the above areas. The following two examples from the project, on this analysis and discussion.